| /* |
| * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. |
| * Copyright (C) 2008 Collabora Ltd. |
| * Copyright (C) 2009 Martin Robinson |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef WTF_GRefPtr_h |
| #define WTF_GRefPtr_h |
| |
| #if ENABLE(GLIB_SUPPORT) |
| |
| #include <wtf/AlwaysInline.h> |
| #include <wtf/RefPtr.h> |
| #include <algorithm> |
| |
| extern "C" void g_object_unref(gpointer); |
| extern "C" gpointer g_object_ref_sink(gpointer); |
| |
| namespace WTF { |
| |
| enum GRefPtrAdoptType { GRefPtrAdopt }; |
| template <typename T> inline T* refGPtr(T*); |
| template <typename T> inline void derefGPtr(T*); |
| template <typename T> class GRefPtr; |
| template <typename T> GRefPtr<T> adoptGRef(T*); |
| |
| template <typename T> class GRefPtr { |
| public: |
| GRefPtr() : m_ptr(0) { } |
| |
| GRefPtr(T* ptr) |
| : m_ptr(ptr) |
| { |
| if (ptr) |
| refGPtr(ptr); |
| } |
| |
| GRefPtr(const GRefPtr& o) |
| : m_ptr(o.m_ptr) |
| { |
| if (T* ptr = m_ptr) |
| refGPtr(ptr); |
| } |
| |
| template <typename U> GRefPtr(const GRefPtr<U>& o) |
| : m_ptr(o.get()) |
| { |
| if (T* ptr = m_ptr) |
| refGPtr(ptr); |
| } |
| |
| ~GRefPtr() |
| { |
| if (T* ptr = m_ptr) |
| derefGPtr(ptr); |
| } |
| |
| void clear() |
| { |
| T* ptr = m_ptr; |
| m_ptr = 0; |
| if (ptr) |
| derefGPtr(ptr); |
| } |
| |
| T* leakRef() WARN_UNUSED_RETURN |
| { |
| T* ptr = m_ptr; |
| m_ptr = 0; |
| return ptr; |
| } |
| |
| // Hash table deleted values, which are only constructed and never copied or destroyed. |
| GRefPtr(HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { } |
| bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); } |
| |
| T* get() const { return m_ptr; } |
| T& operator*() const { return *m_ptr; } |
| ALWAYS_INLINE T* operator->() const { return m_ptr; } |
| |
| bool operator!() const { return !m_ptr; } |
| |
| // This conversion operator allows implicit conversion to bool but not to other integer types. |
| typedef T* GRefPtr::*UnspecifiedBoolType; |
| operator UnspecifiedBoolType() const { return m_ptr ? &GRefPtr::m_ptr : 0; } |
| |
| GRefPtr& operator=(const GRefPtr&); |
| GRefPtr& operator=(T*); |
| template <typename U> GRefPtr& operator=(const GRefPtr<U>&); |
| |
| void swap(GRefPtr&); |
| friend GRefPtr adoptGRef<T>(T*); |
| |
| private: |
| static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); } |
| // Adopting constructor. |
| GRefPtr(T* ptr, GRefPtrAdoptType) : m_ptr(ptr) {} |
| |
| T* m_ptr; |
| }; |
| |
| template <typename T> inline GRefPtr<T>& GRefPtr<T>::operator=(const GRefPtr<T>& o) |
| { |
| T* optr = o.get(); |
| if (optr) |
| refGPtr(optr); |
| T* ptr = m_ptr; |
| m_ptr = optr; |
| if (ptr) |
| derefGPtr(ptr); |
| return *this; |
| } |
| |
| template <typename T> inline GRefPtr<T>& GRefPtr<T>::operator=(T* optr) |
| { |
| T* ptr = m_ptr; |
| if (optr) |
| refGPtr(optr); |
| m_ptr = optr; |
| if (ptr) |
| derefGPtr(ptr); |
| return *this; |
| } |
| |
| template <class T> inline void GRefPtr<T>::swap(GRefPtr<T>& o) |
| { |
| std::swap(m_ptr, o.m_ptr); |
| } |
| |
| template <class T> inline void swap(GRefPtr<T>& a, GRefPtr<T>& b) |
| { |
| a.swap(b); |
| } |
| |
| template <typename T, typename U> inline bool operator==(const GRefPtr<T>& a, const GRefPtr<U>& b) |
| { |
| return a.get() == b.get(); |
| } |
| |
| template <typename T, typename U> inline bool operator==(const GRefPtr<T>& a, U* b) |
| { |
| return a.get() == b; |
| } |
| |
| template <typename T, typename U> inline bool operator==(T* a, const GRefPtr<U>& b) |
| { |
| return a == b.get(); |
| } |
| |
| template <typename T, typename U> inline bool operator!=(const GRefPtr<T>& a, const GRefPtr<U>& b) |
| { |
| return a.get() != b.get(); |
| } |
| |
| template <typename T, typename U> inline bool operator!=(const GRefPtr<T>& a, U* b) |
| { |
| return a.get() != b; |
| } |
| |
| template <typename T, typename U> inline bool operator!=(T* a, const GRefPtr<U>& b) |
| { |
| return a != b.get(); |
| } |
| |
| template <typename T, typename U> inline GRefPtr<T> static_pointer_cast(const GRefPtr<U>& p) |
| { |
| return GRefPtr<T>(static_cast<T*>(p.get())); |
| } |
| |
| template <typename T, typename U> inline GRefPtr<T> const_pointer_cast(const GRefPtr<U>& p) |
| { |
| return GRefPtr<T>(const_cast<T*>(p.get())); |
| } |
| |
| template <typename T> inline T* getPtr(const GRefPtr<T>& p) |
| { |
| return p.get(); |
| } |
| |
| template <typename T> GRefPtr<T> adoptGRef(T* p) |
| { |
| return GRefPtr<T>(p, GRefPtrAdopt); |
| } |
| |
| template <> GHashTable* refGPtr(GHashTable* ptr); |
| template <> void derefGPtr(GHashTable* ptr); |
| template <> GMainContext* refGPtr(GMainContext* ptr); |
| template <> void derefGPtr(GMainContext* ptr); |
| template <> GMainLoop* refGPtr(GMainLoop* ptr); |
| template <> void derefGPtr(GMainLoop* ptr); |
| template <> GVariant* refGPtr(GVariant* ptr); |
| template <> void derefGPtr(GVariant* ptr); |
| template <> GSource* refGPtr(GSource* ptr); |
| template <> void derefGPtr(GSource* ptr); |
| template <> GPtrArray* refGPtr(GPtrArray*); |
| template <> void derefGPtr(GPtrArray*); |
| template <> GByteArray* refGPtr(GByteArray*); |
| template <> void derefGPtr(GByteArray*); |
| template <> GBytes* refGPtr(GBytes*); |
| template <> void derefGPtr(GBytes*); |
| |
| template <typename T> inline T* refGPtr(T* ptr) |
| { |
| if (ptr) |
| g_object_ref_sink(ptr); |
| return ptr; |
| } |
| |
| template <typename T> inline void derefGPtr(T* ptr) |
| { |
| if (ptr) |
| g_object_unref(ptr); |
| } |
| |
| } // namespace WTF |
| |
| using WTF::GRefPtr; |
| using WTF::adoptGRef; |
| |
| #endif // ENABLE(GLIB_SUPPORT) |
| |
| #endif // WTF_GRefPtr_h |